have you looked
Visas you want a
B2
1.The advice from the embassy is not to book flights / hotels without a visa. It does in my opinion help to show that you have actually looked at the costs of hotels / flights etc by showing some itinerary. no need to pay for anything but you could go on websites like expedia, lastminute.com etc and search for flights hotels and make and print out itinerary and also more importantly these can used to show you have
ties
2. Only your husband needs to apply. infact if you apply you are likely to be denied as you can travel using British passport without visa. You may want to look at doing
ESTA to makesure you qualify. you do have to pay about $14 per application
3. n/a see 1. only husband to apply. in the event that the whole family were to apply i doubt that 1 would get whilst others didnt
4. i believe it will be taken into account as you have to show you have sufficient funds to cover trip, this why my point about doing itinerary is important.
the most important thing will be to show (your husband) that he has ties in the UK, so fact that he has family is helpful, if he has a permanent job that will be useful too so confirmation letter from employer would be ideal, if you guys own your own home details about this would be usefull.
How many years has your husband been in the UK for?
only call the number when you are ready to book the appointment and have passport and ready before you dial. i have paid close to 20 pounds on one call before